/* eslint-disable */
let radius = 120;
let dtr = Math.PI / 180;
let d=300;
let mcList = [];
let active = true;
let lasta = 1;
let lastb = 1;
let distr = true;
let tspeed = 1;
let size = 250;

let mouseX = 0;
let mouseY = 0;

let howElliptical = 1;

let aA = null
let oDiv
let sa
let ca
let sb
let cb
let sc
let cc
let per
let time = null

export function stop () {
  clearInterval(time);
}
export function init ()
{
  var i = 0;
  var oTag = null;

  oDiv = document.getElementById('tagsList');
  aA = oDiv.getElementsByTagName('a');
  mcList = []
  for(i = 0;i < aA.length;i++)
  {
    oTag = {};

    oTag.offsetWidth=aA[i].offsetWidth;
    oTag.offsetHeight=aA[i].offsetHeight;

    mcList.push(oTag);
  }
  sineCosine( 1.2,1.2,0 );

  positionAll();

  oDiv.onmouseover=function ()
  {
    active=false;
  };

  oDiv.onmouseout=function ()
  {
    active=true;
  };

  oDiv.onmousemove=function (ev)
  {
    var oEvent=window.event || ev;

    mouseX=oEvent.clientX-(oDiv.offsetLeft+oDiv.offsetWidth/2);
    mouseY=oEvent.clientY-(oDiv.offsetTop+oDiv.offsetHeight/2);

    mouseX/=5;
    mouseY/=5;
  };

  time = setInterval(update, 100);
};

function update()
{
  var a;
  var b;

  if(active)
  {
    a = (-Math.min( Math.max(-size ), size ) / radius ) * tspeed;
    b = (Math.min( Math.max(-size ), size ) / radius ) * tspeed;
  }
  else
  {
    a = lasta * 0.8;
    b = lastb * 0.8;
  }

  lasta=a;
  lastb=b;

  if(Math.abs(a)<=0.001 && Math.abs(b)<=0.001)
  {
    return;
  }

  var c=0;
  sineCosine(a,b,c);
  for(var j=0;j<mcList.length;j++)
  {
    var rx1=mcList[j].cx;
    var ry1=mcList[j].cy*ca+mcList[j].cz*(-sa);
    var rz1=mcList[j].cy*sa+mcList[j].cz*ca;

    var rx2=rx1*cb+rz1*sb;
    var ry2=ry1;
    var rz2=rx1*(-sb)+rz1*cb;

    var rx3=rx2*cc+ry2*(-sc);
    var ry3=rx2*sc+ry2*cc;
    var rz3=rz2;

    mcList[j].cx=rx3;
    mcList[j].cy=ry3;
    mcList[j].cz=rz3;

    per=d/(d+rz3);

    mcList[j].x=(howElliptical*rx3*per)-(howElliptical*2);
    mcList[j].y=ry3*per;
    mcList[j].scale=per;
    mcList[j].alpha=per;

    mcList[j].alpha=(mcList[j].alpha-0.6)*(10/6);
  }

  doPosition();
  depthSort();
}

function depthSort()
{
  var i=0;
  var aTmp=[];

  for(i=0;i<aA.length;i++)
  {
    aTmp.push(aA[i]);
  }

  aTmp.sort
  (
    function (vItem1, vItem2)
    {
      if(vItem1.cz>vItem2.cz)
      {
        return -1;
      }
      else if(vItem1.cz<vItem2.cz)
      {
        return 1;
      }
      else
      {
        return 0;
      }
    }
  );

  for(i=0;i<aTmp.length;i++)
  {
    aTmp[i].style.zIndex=i;
  }
}

function positionAll()
{
  var phi=0;
  var theta=0;
  var max=mcList.length;
  var i=0;

  var aTmp=[];
  var oFragment=document.createDocumentFragment();


  for(i=0;i<aA.length;i++)
  {
    aTmp.push(aA[i]);
  }

  aTmp.sort
  (
    function ()
    {
      return Math.random()<0.5?1:-1;
    }
  );

  for(i=0;i<aTmp.length;i++)
  {
    oFragment.appendChild(aTmp[i]);
  }

  oDiv.appendChild(oFragment);

  for( var i=1; i<max+1; i++){
    if( distr )
    {
      phi = Math.acos(-1+(2*i-1)/max);
      theta = Math.sqrt(max*Math.PI)*phi;
    }
    else
    {
      phi = Math.random()*(Math.PI);
      theta = Math.random()*(2*Math.PI);
    }
    mcList[i-1].cx = radius * Math.cos(theta)*Math.sin(phi);
    mcList[i-1].cy = radius * Math.sin(theta)*Math.sin(phi);
    mcList[i-1].cz = radius * Math.cos(phi);

    aA[i-1].style.left=mcList[i-1].cx+oDiv.offsetWidth/2-mcList[i-1].offsetWidth/2+'px';
    aA[i-1].style.top=mcList[i-1].cy+oDiv.offsetHeight/2-mcList[i-1].offsetHeight/2+'px';
  }
}

function doPosition()
{
  var l=oDiv.offsetWidth/2;
  var t=oDiv.offsetHeight * 0.5;
  for(var i=0;i<mcList.length;i++)
  {
    aA[i].style.left=mcList[i].cx+l-mcList[i].offsetWidth/2+'px';
    aA[i].style.top=mcList[i].cy+t-mcList[i].offsetHeight/2+'px';

    aA[i].style.fontSize=Math.ceil(18*mcList[i].scale/2)+15+'px';

    aA[i].style.filter="alpha(opacity="+100*mcList[i].alpha+")";
    aA[i].style.opacity=mcList[i].alpha;
  }
}

function sineCosine( a, b, c)
{
   sa = Math.sin(a * dtr);
   ca = Math.cos(a * dtr);
   sb = Math.sin(b * dtr);
   cb = Math.cos(b * dtr);
   sc = Math.sin(c * dtr);
   cc = Math.cos(c * dtr);
}

